Quote:
Originally Posted by synolimit
Actually we figured it out on ar15.com. The bullets traveling fast enough and the time it takes for the bullet to hit the plate from start to finish is more powerful then the slower .308 or 8mm Mauser. Like hitting a nail with a hammer vs pushing on the nail with a rock and all your weight. You can get more power with a rock and weight but at a longer time with no penetration. At 3700fps the little 5.56 is actually going fast enough it's exceeding the breaking point of the steel. We can see this from the ar500 actually chipping at the very tip where the round entered.
And I'm not sure where you heard barrel length doesn't increase velocity but that's false. Every inch in a 5.56 is about 200fps. My 10" barrel shooting the same rounds is over 1000fps slower vs his 24".
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Interesting. Since most of my 5.56 platform guns are 16", muzzle velocity doesn't matter much to me. While the 5.56 will shoot to 600 yards, I don't see much need to shoot that range with that small of round. For 600 to 1000 yards, I prefer a .308 or .30-06 (again, personal opinion/preference). While muzzle velocity will increase to a point over a 10" barrel, there is a barrel length that you get max velocity, anything over that will actually cause a decrease. So maybe I was a little out of line saying 'BS' on the m.v. claim. Unless you were shooting over a chronograph to get an accurate reading on velocity, someone saying his muzzle velocity is xxxx, I tend to be a little skeptical. That's just me. I'm more of an accuracy guy, I load to what gives me the best performance out of my gun at the range I want to use it for. For what it's worth, I just looked at Federal's website for their ammunition. It shows that a 55 grain boat tail is driven at 3240 fps. They show 3700 fps with a 40 grain Nosler Ballistic Tip.
I definitely don't want to get into a disagreement over m.v. on a 5.56, or what it does to body armor. I've been around firearms for a long time, and I tend to be skeptical when someone claims a m.v. that sounds outrageous to me. It's great that there are Z owners that enjoy firearms and shooting, so on that note, I'll say no more about 5.56 m.v.
